题目/Title：一种用于GPS接收机中的自适应A/D转换器
                        Adaptive Analog-to-Digital Converter for GPS Receiver

作者/Author：段静波,曹奉祥,李永明,张春,Seeteck Tan
                        Jingbo Duan,Fengxiang Cao,Yongming Li,Chun Zhang,Seeteck Tan

期刊/Journal：微电子学 Microelectronics

年份/Issue Date：2007

卷（期）及页码/Volume（No.）&pages：Vol.37, No.3, pp. 378 - 381

摘要/Abstract：
基于SMIC 0.18μm工艺,设计了一个2位自适应A/D转换器。设计中,采用新的2位结构和充电电流可调电荷泵,使其不但对连续波干扰可起到很好的抑制作用,改善转换器在高斯噪声环境中的转换增益,而且可以抑制不同强度的连续波干扰。仿真结果表明,其输入动态范围为50 dB,采样带宽为20 MHz,可满足GPS应用的要求。该电路已应用在BPSK调制的直接扩频GPS接收机中。
A 2-bit adaptive analog-to-digital converter is designed using SMIC\'s 0.18 μm CMOS process.A new 2-bit structure and a current tunable charge pump are used.Thus, it can almost completely suppress the continuous wave and improve its conversion gain in Gaussian noise environment,and suppress interferences with different amplitude.Simulation results show that the converter has achieved an input dynamic range of 50 dB and a sampling bandwidth of 20 MHz,which meets the specification of GPS.The circuit has been used in a BPSK modulated direct GPS receiver.